<!DOCTYPE html>
<html>
<head>
    <title>Bootstrap 实例</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/css/bootstrap.min.css">
    <script src="https://cdn.staticfile.org/jquery/3.2.1/jquery.min.js"></script>
    <script src="https://cdn.staticfile.org/popper.js/1.15.0/umd/popper.min.js"></script>
    <script src="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/js/bootstrap.min.js"></script>
</head>
<body>

<div class="jumbotron text-center">
    <h1>我的第一个</h1>
    <p>重置浏览器大小查看效果!</p>
</div>
<p><a href="https://www.runoob.com/bootstrap4/bootstrap4-tutorial.html">菜鸟教程 - BootStrap4</a></p>
</body>
</html>